When you're jerking off to porn and realize you've seen the video before leading to you remembering the time you blew your load to it.
"Whoa..."

"What's wrong Neo?"

"I think I jerked it to this porno when I was younger."

"You remember jacking off to it?"

"Yea...what a nostalgia nut."

"Sick dude, let's blow each other again."
by ThisIsMatthewCastro June 22, 2018
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A nostalgic memory from something you like (like a video game you used to play) and that nostalgia is so good it gives you a mental orgasm
Person 1: Dude, I was playing skyrim the other day and when the soundtrack kicked in I got a weird mental orgasm

Person 2: Oh I feel you, its like a nostalgia nut, right?

Person 1: EXACTLY!
by Harolds BJBJ's December 3, 2019
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When you remember a chick when she was younger and she was hotter but you bust a nut to that feeling.
Hey Joseph, I just had a nostalgia Nut to arial
Damn, same!
by GenerousWombat83 September 25, 2023
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